content: /*
   * Copyright 2017 David Karnok
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package hu.akarnokd.reactive4javaflow;
  
  import hu.akarnokd.reactive4javaflow.processors.*;
  import org.openjdk.jmh.annotations.*;
  
  import java.util.concurrent.*;
  
  /**
   * Example benchmark. Run from command line as
   * <br>
   * gradle jmh -Pjmh="CompletableFutureComparisonPerf"
   */
  @BenchmarkMode(Mode.Throughput)
  @Warmup(iterations = 5)
  @Measurement(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS)
  @OutputTimeUnit(TimeUnit.SECONDS)
  @Fork(value = 1)
  @State(Scope.Thread)
  public class CompletableFutureComparisonPerf {
  
      final CompletableFuture<Integer> completedFuture = CompletableFuture.completedFuture(1);
  
      LastProcessor<Integer> lastProcessor;
  
      @Setup
      public void setup() {
          lastProcessor = new LastProcessor<>();
          lastProcessor.onNext(1);
          lastProcessor.onComplete();
      }
  
      @Benchmark
      public Object completableFuture() throws Exception {
          CompletableFuture<Integer> cf = new CompletableFuture<>();
          cf.complete(1);
          return cf.get();
      }
  
      @Benchmark
      public Object completableFutureNow() throws Exception {
          CompletableFuture<Integer> cf = new CompletableFuture<>();
          cf.complete(1);
          return cf.getNow(null);
      }
  
      @Benchmark
      public Object completableFutureCompleted() throws Exception {
          return completedFuture.get();
      }
  
      @Benchmark
      public Object completableFutureCompletedNow() throws Exception {
          return completedFuture.getNow(null);
      }
  
      @Benchmark
      public Object directProcessor() {
          DirectProcessor<Integer> dp = new DirectProcessor<>();
          dp.onNext(1);
          dp.onComplete();
  
          return dp.blockingLast();
      }
  
      @Benchmark
      public Object lastProcessor() {
          LastProcessor<Integer> dp = new LastProcessor<>();
          dp.onNext(1);
          dp.onComplete();
  
          return dp.blockingLast();
      }
  
      @Benchmark
      public Object lastProcessorValue() {
          LastProcessor<Integer> dp = new LastProcessor<>();
          dp.onNext(1);
          dp.onComplete();
  
          return dp.getValue();
      }
  
      @Benchmark
      public Object lastProcessorCompleted() {
          return lastProcessor.blockingLast();
      }
  
      @Benchmark
      public Object lastProcessorCompletedValue() {
          return lastProcessor.getValue();
      }
  }